I've Left My Hawken loaded for almost a year once "kinda forgot about it when Moma had our first child & all" & it still went bang...

But if you were in the rain during the hunt you may want to shoot that load off or at least pull it so that you know that it's not moisture contaminated...

On a side note, I've had a Repro Colt 1851 Navy loaded for almost 9 years "I used to keep one loaded as a alternative Home Deffence weapon" but had it in it's case CAPPED!
It also shot quite well.